Guarding a device against a cyber threat

摘要

Disclosed herein is a method for guarding a first device (12) against a cyber threat. A transaction record (52) is received on a ledger (50) distributed amongst a plurality of nodes (12, 14, 36) including the first device (12); receiving at least one message (105, 308, 213), via a secure communication channel (20), from an authenticated second device (14). The message may include an identifier (Hash(Tx1)) for the first transaction (Tx1). The identifier may be used to read the record (52). The record may include a first validation tool. Validity of first data received in the record and/or the message may be verified using the first validation tool and/or a second validation tool; and in an event that a predefined condition is met, an operation of the first device may be executed based on the first data, the predefined condition requiring at least that the validity is verified.